74 строки
2.2 KiB
C
74 строки
2.2 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include <stdio.h>
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#include "mpi/c/bindings.h"
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#include "ompi/datatype/datatype.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Get_elements = PMPI_Get_elements
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Get_elements";
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int MPI_Get_elements(MPI_Status *status, MPI_Datatype datatype, int *count)
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{
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int size, i;
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if (MPI_PARAM_CHECK) {
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OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
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}
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*count = 0;
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if( ompi_ddt_type_size( datatype, &size ) == MPI_SUCCESS ) {
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if( size == 0 ) {
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*count = MPI_UNDEFINED;
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return MPI_SUCCESS;
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}
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*count = status->_count / size;
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size = status->_count - (*count) * size;
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/* if basic type we should return the same result as MPI_Get_count */
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if( datatype->flags & DT_FLAG_PREDEFINED ) {
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if( size != 0 ) {
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*count = MPI_UNDEFINED;
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}
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return MPI_SUCCESS;
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}
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if( (*count) != 0 ) {
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int total; /* count the basic elements in the datatype */
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for( i = 4, total = 0; i < DT_MAX_PREDEFINED; i++ )
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total += datatype->btypes[i];
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*count = total * (*count);
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}
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if( size > 0 ) {
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if( (i = ompi_ddt_get_element_count( datatype, size )) != -1 )
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*count += i;
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else
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*count = MPI_UNDEFINED;
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}
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return MPI_SUCCESS;
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}
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, FUNC_NAME);
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}
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